<template>
  <div>
    <ul>
      <li v-for="(item, index) in arr" :key="index">{{ item }}</li>
    </ul>
    <button @click="btnFn">走一走</button>
  </div>
</template>
 
<script>
export default {
  data() {
    return {
      arr: ['帅哥', '美女', '程序猿']
    }
  },
  methods: {
    btnFn() {
      this.arr.unshift(this.arr.pop())
    }
  }
}
</script>

<style scoped>
</style>